ALMA captures surprising activity in comet C/2014 UN271, Bernardinelli-Bernstein comet, the largest ever detected.

NASA's Voyager 2 spacecraft captured dark streaks produced by geysers visible on the icy surface of Triton's south polar ...

The enigma of the intruder about the same size as Manhattan Island is making astronomers rethink what they know about cosmic ...

Astronomers have spotted a free-floating ‘rogue’ planet, named Cha 1107-7626, that is going through a massive growth spurt, ...

WASHINGTON (Reuters) -Just as Earth orbits the sun, most planets discovered beyond our solar system orbit a host star.

The solar system is a grand cosmic stage where each planet and moon plays a unique role in a story billions of years in the making. From Mercury’s shrinking surface and Venus’s runaway greenhouse ...

Cassini probe conducted closest Enceladus flyby in 2008 Clearer picture emerges of moon's subsurface chemistry Under its frozen outer crust resides a subsurface ocean A fresh look at data collected by ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

(CNN) — The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have ...